2つの無機機能群を用いた化学的に可逆の4電子酸化と還元です
Michael Nippe1, Samuel M Goodman, Charles G Fry
1Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, USA.
Journal of the American Chemical Society
|February 16, 2011
まとめ
新しいボルンガムオクソ化合物は,惰性単核種とは異なり,可逆的な4電子反応を示しています. この反応性は,ディタングステン複合体における協力的なW-OとW-Wの多重結合から生じる.
科学分野:
- 無機化学 無機化学とは
- 有機金属化学 有機金属化学
- マテリアルサイエンス 材料科学
背景:
- 単核トングステンオクソ種は,典型的には化学的に惰性である.
- 四重結合の二核トングステン化合物は,ユニークな反応性を提供しています.
- マルチエレクトロン・レドックスプロセスを理解することは,触媒と材料にとって極めて重要です.
研究 の 目的:
- 新型ディタングステン末端オクソ化合物を合成し,特徴づけること.
- 新しい化合物の酸化還元反応と化学反応性を調査する.
- 観察された反応性における協同的多重結合の役割を調査する.
主な方法:
- 四重結合のW(2)(II,II) 前駆体.の合成
- 4エレクトロンの酸化により,ディタングステンの末端オクソ化合物が形成されます.
- アセトニトリル中のトリートル・ブチルホスフィンを用いた4電子還元.
主要な成果:
- 新しい,ダイアマグネティックなディタングステンの末端オクソ化合物の形成 [W(2) O(2,2'-ディピリジラミド) ((4)) ] ((2+).
- ディタングステンのオクソ化合物は,酸素原子の移転により,容易な4電子の還元を経験します.
- オリジナルの二核トングステンの前駆体であるW(2)(2,2'-ディピリジラミド)(4) が回収され,化学的反転性を証明した.
結論:
- 合成されたディタングステン・オクソ化合物は,異常で,化学的に可逆的な多電子反応性を示しています.
- この反応性は,W-OとW-Wの多重結合の相乗効果に起因する.
- この発見は,オキシオスチレン種の一般的惰性性に異議を唱え,協力的な結合を強調しています.
関連する概念動画
01:19Oxidation and Reduction of Organic Molecules
Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
The removal of an electron from a molecule, results in a...
01:24Redox Reactions
Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
01:27Redox Reactions
Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
01:17Oxidation of Phenols to Quinones
In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox property is crucial in...
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox property is crucial in...
03:11Oxidation-Reduction Reactions
Oxidation–Reduction Reactions
01:23Redox Equilibria: Overview
A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...